intfield.java

用A star

import java.awt.*;

public class IntField extends java.awt.Panel
{
	private TextField myField;
	private Label myLabel;

	public IntField()
	{
	myField = new TextField();
	setLayout(new BorderLayout());
	add("Center", myField);
	}

	public IntField(int cols)
	{
	myField = new TextField(cols);
	setLayout(new BorderLayout());
	add("Center", myField);
	}

	public IntField(int num, int cols)
	{
	myField = new TextField("" + num, cols);
	setLayout(new BorderLayout());
	add("Center", myField);
	}

	public int getInt()
	{
		try
		{
			int num = Integer.parseInt(myField.getText());
			return num;
		}
		catch (NumberFormatException ex)
		{
			return 0;
		}
	}

	public void setInt(int num)
	{
		myField.setText(Integer.toString(num));
	}

	public void setInt()		// dr
	{					// dr
		myField.setText("");		// dr
	}					// dr
        
	public void addLabel(String lab)		
	{
	if (myLabel == null) {
		myLabel = new Label(lab);
		remove(myField);
		add("West", myLabel);
		add("Center", myField);
	}
	else myLabel.setText(lab);
	}

	public void setLabel(String lab)
	{
	addLabel(lab);
	}

	public void setEditable(boolean b)
	{
	myField.setEditable(b);
	}

	public int getColumns()
	{
	return myField.getColumns();
	}

	public boolean handleEvent(Event e)
	{
	if ((e.id == Event.KEY_PRESS) && (e.target == myField))
	{
		int key = e.key;
		// numbers are always okay
		if ((key > 47) && (key < 58)) return myField.keyDown(e,key);
     
		// minus sign okay if it's the first character
		if ((key == 45) && ((myField.getText().equals("")) || 
			(myField.getText().equals(myField.getSelectedText()))))
		return myField.keyDown(e,key);
         
		// backspace and delete
		if ((key == 8) || (key == 127)) return myField.keyDown(e,key);
            
		// arrow keys, home, end, pgup, pgdown okay
		if ((key > 999) && (key < 1008))
		return myField.keyDown(e,key);

		// Enter--pass Action event up hierarchy
		if (key == 10)
		{
		e.id = Event.ACTION_EVENT;
		e.target = this;
		return false;
		}

		// no other keys should do anything, so ignore them all
		return true;
	}

	return super.handleEvent(e);
	}
}